I will not speak for Conrad but I think his concern is that WD 40 starts out very thin but eventually turns into a pretty thick paste. It might not be the best thing to spray into that activation switch.
There is supposedly a stronger spring that Kawasaki is supplying but I have not seen one and there is no official word from Kawasaki. The ignition switch assembly has been superceded on the earlier C-14's (GTR's) but no one knows exactly what the changes were.
A sticking activation switch and interference from a fuel pump are two different problems and not related to each other. If the switch sticks you cannot activate KiPass. Interference will cause the system to fail to find a valid fob but you will be able to power the system up by pressing down on the key. So if you press the key and the system powers up but has radio interference from a fuel pump, you should get some type of warning on the LCD. If the activation switch is stuck down you will not see anything on the LCD at all. Also if moving the bike away from the fuel pump 'cures' the problem, it was radio interference, not a sticking activation switch.
Brian
If Brian's technique does not work, yes you can spray some WD40 as shown below, sometimes the spring gets stuck and you cannot start the bike with this damn keypass ! It may not be strong enough after all for this system.